Abstract
The clover leaf weevil ( Hypera punctata F.) is a sporadic but potentially serious pest of alfalfa ( Medicago sativa L.). Feeding of newly emerged adult fourth instar clover leaf weevil was simulated in a field study at the University of Nebraska Haskell Agricultural Research Lab near Concord, NE, in May 2001 and 2002. Twelve 1‐ by 1‐m plots were arranged in a randomized complete block design with three treatments and four replications. Treatments consisted of two levels of simulated clover leaf weevil defoliation of alfalfa and an undefoliated check. Leaflets were removed over 10 d. Dry matter yield and other plant responses were measured during the first two growth cycles. Yield differences among all three treatments were significant for the first growth cycle. The relationship between percentage defoliation and percentage yield reduction was linear both years. Defoliation did not significantly affect percentages of acid detergent fiber, neutral detergent fiber, and protein. Alfalfa development also was not significantly affected in the second growth cycle. Dry matter yield reduction as a result of leaf removal at the early bud stage was the most important effect of first growth cycle defoliation.
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Claims 5
Claim · model-written summary
First-cycle dry matter yield differed significantly among the defoliation treatments.
- Taxon
- alfalfa
Medicago sativae0t0 - Treatment
- all three treatmentse0
- Outcome
- Yield differencese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield differences among all three treatments were significant for the first growth cycle”
t0“Alfalfa”
Claim · model-written summary
Yield reduction was linearly related to percentage defoliation in both years.
- Taxon
- alfalfaMedicago sativae0t0
- Treatment
- percentage defoliatione0
- Outcome
- percentage yield reductione0
- Qualifier
- both yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between percentage defoliation and percentage yield reduction was linear both years”
t0“Alfalfa”
Claim · model-written summary
Defoliation did not significantly affect fiber and protein percentages.
- Taxon
- alfalfaMedicago sativae0t0
- Treatment
- Defoliatione0
- Outcome
- percentages of acid detergent fiber, neutral detergent fiber, and proteine0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation did not significantly affect percentages of acid detergent fiber, neutral detergent fiber, and protein”
t0“Alfalfa”
Claim · model-written summary
Defoliation did not significantly affect alfalfa development in the second cycle.
- Taxon
- AlfalfaMedicago sativae0t0
- Outcome
- developmente0
- Direction
- not significantly affectede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa development also was not significantly affected in the second growth cycle”
t0“Alfalfa”
Claim · model-written summary
Leaf removal at early bud stage reduced first-cycle dry matter yield.
- Taxon
- alfalfaMedicago sativae0t0
- Organ / stage
- early bud stagee0
- Treatment
- leaf removale0
- Outcome
- Dry matter yielde0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield reduction as a result of leaf removal at the early bud stage was the most important effect of first growth cycle defoliation”
t0“Alfalfa”
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